import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class SquareAnon extends JFrame {

    private JButton button;
    private JTextField input;

    public SquareAnon() {

        super("Square GUI");

	button = new JButton("Square");
	input = new JTextField();
	 
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        setLayout(new GridLayout(1,2));

        add(button);
        add(input);
        button.addActionListener(new ActionListener() {
		public void actionPerformed(ActionEvent e) {
		    int value;
		    value= Integer.parseInt(input.getText());
		    input.setText(Integer.toString(value * value));
		}
	    });
	pack();
        setVisible(true);
    }

    public static void main(String[] args) {
	Square app;
	app = new Square();
    }
    
}